Sure, you can use demand pricing. Offer the employee minimum wage or the commissions from rides, whichever is greater.

Ah, you say, but what about them being "on the clock" while not actually being willing to drive? The same thing that happens if they turn down a Lyft ride because they're driving an Uber customer: you fire them. And possibly charge them with fraud.

From what I've read here, it seems like all of the "only way a business could operate" responses are based on Uber or Lyft propaganda.